General Joint Types

Classes of Joints

Compiled from “Clinical Anatomy of Bones and Joints” lecture from MED1011

A joint is the location at which two or more bones make contact. They are constructed to allow movement and provide mechanical support, and are classified structurally and functionally.

Different Types of Joints

· Synovial joints

o Knee, hip, shoulder elbow, wrist, interphalangeal.

· Fibrous joint

o Sutures, Interosseous membrane, alveolar ligament

· Cartilaginous joints

o Primary cartilaginous joints

o Secondary cartilaginous joints

Synovial Joints

· Structural Characteristics:

o Bone ends covered by articular (hyaline) cartilage

o Surrounding capsule

o Lined by synovial membrane which produces synovial fluid

o Reinforcing ligaments present

· Movement Characteristics

o Gliding-plane

§ Articular surfaces are flat and almost parallel- movement restricted by ligaments

o Uniaxial

§ Hinge (elbow) or Pivot (radioulnar joints)

o Biaxial

o Multiaxial

o Synovial joints classified by movement and complexity.

· Simple joints- one pair of articular surfaces

· Compound joints- multiple pairs of articular surfaces

· Complex joints- subdivided patially or completed to give two compartments

Fibrous Joints

· Bones are separated by connective tissue only

· Characterised by minimal movement

Cartilaginous Joints

· Primary Cartilaginous Joints

· Secondary Cartilaginous Joints

o Bones ends covered hyaline articular cartilage

o Articular cartilage covering joined by fibro cartilage

o Exclusively midline

Shoulder Joint (Glenohumeral Joint)

· Is synovial/primary cartilaginous joint

o Ball and socket joint

· Allows multiaxial movement

· Rotator cuff (supraspinatus, infraspinatus, teres minor and subscapularus) holds humerous in the glenoid fossa.

Unfortunately, due to copyright restrictions, I cannot post the accompanying pictures, but they can all be found in the aformentioned lecture from semester I

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~ by pcl4 on August 6, 2008.

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